§ 149. Through highway. Every highway or portion thereof on which
vehicular traffic is given preferential right of way, and at the
entrances to which vehicular traffic from intersecting highways is
controlled by traffic-control signals or is required by law to yield the
right of way to vehicles on such through highway in obedience to a
flashing red signal, a stop sign or a yield sign, when such signals or
signs are erected as provided in this chapter.